popolazione mondiale in formato digitale

["AlessandroGimona"<agimona@libero.it>]

Cari tutti segnalo la disponibilita' di un interessante data base sul 
sito del  'Columbia University's Center for International Earth Science 
Information Network (CIESIN)'

http://sedac.ciesin.org/plue/gpw/

Si tratta di una mappa digitale e relativo data base della popolazione 
mondiale...entrambi scaricabili (vedi sotto) 


 
Spero interessi

Alessandro Gimona


Demographic information is often provided on a national basis, but 
global environmental and other cross-disciplinary studies usually 
require data that are referenced by geographic coordinates, such as 
latitude and longitude, rather than by political or administrative 
units. In this Gridded Population of the World (GPW) data set, the 
distribution of human population is converted from national or 
subnational units to a series of georeferenced quadrilateral grids. 
Developed in 1999-2000, GPW version 2, incorporates a number 
improvements to the original version of this popular dataset.
 GPW version 2 provides estimates of the population of the world in 
1990 and 1995, both population counts (raw counts) and population 
densities (per square km). National figures have been reconciled to be 
consistent with United Nations population estimates for those years; 
unadjusted data are also available. Both images and data are accessible 
and downloadable.